Have you ever seen him improvise? His type of comedy may not appeal to all, but a "johnny one note". Have to heartily disagree with you on that one.
I've seen a lot of comedians live, in small venues. Only two brought down the house - Milton Berle and Williams.
Williams was having so much fun after two hours he had to be chased off the stage. He would have stayed all night.
If I got hung up on any entertainer's substance abuse, I wouldn't be able to enjoy anything. The list is endless.
Yes I have seen darn near everything he has done saw him on stage once I heartily agree he just plays Robin Willaims all the time I like most of his work and I wish him well